unless you're worried about points judging, any 70-72 F-body dual snorkle air cleaner will be perfect for you.
The 1971 L78-400(4bbl) & L75-455(4bbl) & 1972 L78-400(4bbl) air cleaners are (as far as I know) exactly the same unit that a 1970 Van Nuys car would have recieved - they only differ by the hole for the quadrajet airhorn breather tub (which you can plug with an available part).
I do believe that they are reproduced, but do not know if those come with the heat riser stuff installed.
Good luck!
The attached images are a comparison of a 1970 A/G-body air cleaner, and a 1971/1972 F-body air cleaner.
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1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.
1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)
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